Re: [PATCH v4] Allow update hooks to update refs on their own.

> ..., but an
> "ok, but btw I changed your commit" status from receive-pack seems like
> it would be useful, for two reasons:
>
>   - it can be displayed differently, so the user is reminded to do a
>     fetch afterwards
>   - we can avoid updating the tracking ref, which makes it less likely
>     to result in a non-fast forward fetch next time.  For example,
>     consider:
>
>       1. The remote master and my origin/master are at A.
>       2. I make a commit B on top of A.
>       3. I push B to remote, who rewrites it to B' on top of A. At the
>          same time, I move my origin/master to B.
>       4. I fetch, and get non-ff going from B to B'.
>
>     If I had never written anything to my origin/master, it would be a
>     fast forward. And obviously git handles it just fine, but it is more
>     useful to the user during the next fetch to see A..B rather than
>     B'...B.